Apply exclude patterns when shoveling into FileList

FileList#<< pushed the new entry after resolve and never ran it
through excluded_from_list?, so a name added after #exclude (or one
matching a default ignore pattern such as core or *.bak) leaked into
the list while #include correctly dropped it. Filter the appended
name so #<< shares the same exclusion semantics as #include, which
also means default ignore patterns now apply to shoveled entries.

#637

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: hsbt

lib/rake/file_list.rb

@@ -202,7 +202,8 @@ def *(other)
 
     def <<(obj)
       resolve
-      @items << Rake.from_pathname(obj)
+      fn = Rake.from_pathname(obj)
+      @items << fn unless excluded_from_list?(fn)
       self
     end
 

test/test_rake_file_list.rb

@@ -100,6 +100,21 @@ def test_append_pathname
     assert_equal ["a.rb"], fl
   end
 
+  def test_append_respects_exclude
+    fl = FileList.new
+    fl.exclude("abc.c")
+    fl << "abc.c"
+    assert_equal [], fl.to_a
+  end
+
+  def test_append_respects_default_ignore_patterns
+    fl = FileList.new
+    fl << "core"
+    fl << "x.bak"
+    fl << "keep.rb"
+    assert_equal ["keep.rb"], fl.to_a
+  end
+
   def test_add_many
     fl = FileList.new
     fl.include %w(a d c)